It only does 3G on the 2100MHz band, which T-Mobile uses. AT&T (are there any other GSM
carriers left in .us?) uses the 1900MHz band, so if you're in .us, T-Mobile is your only choice if you
want 3G on the Dev Phone or G1.
Posted Dec 30, 2008 14:21 UTC (Tue) by nedrichards (guest, #23295)
[Link]
The G1 supports UMTS/HSDPA etc on 1700 and 2100 MHz. Most of Europe etc. use 2100 in the USA. AT&T uses 850 and 1900MHz and T-Mobile US are using 1700MHz (although I think they have some spectrum in 2100 as well).